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[097/150] USB: serial: fix interface refcounting

Message ID 1364311249-14454-98-git-send-email-luis.henriques@canonical.com
State New
Headers show

Commit Message

Luis Henriques March 26, 2013, 3:19 p.m. UTC 
3.5.7.9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jhovold@gmail.com>

commit d7971051e4df825e0bc11b995e87bfe86355b8e5 upstream.

Make sure the interface is not released before our serial device.

Note that drivers are still not allowed to access the interface in
any way that may interfere with another driver that may have gotten
bound to the same interface after disconnect returns.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 drivers/usb/serial/usb-serial.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 771adbd..2418551 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -157,6 +157,7 @@  static void destroy_serial(struct kref *kref)
 		}
 	}
 
+	usb_put_intf(serial->interface);
 	usb_put_dev(serial->dev);
 	kfree(serial);
 }
@@ -614,7 +615,7 @@  static struct usb_serial *create_serial(struct usb_device *dev,
 	}
 	serial->dev = usb_get_dev(dev);
 	serial->type = driver;
-	serial->interface = interface;
+	serial->interface = usb_get_intf(interface);
 	kref_init(&serial->kref);
 	mutex_init(&serial->disc_mutex);
 	serial->minor = SERIAL_TTY_NO_MINOR;